Community
Fans, engaged customers & local supporters
The people who care most about what you do are a form of organizational memory worth tending deliberately.
A community can mean a formal user group or something much looser: a handful of advocates, a local network, a group that shows up to your events year after year. Whatever shape it takes, it represents knowledge about who your work matters to and why.
What often goes unrecorded is the texture of those relationships: who the connectors are, what motivated people to get involved, what they actually talk about when they gather. That kind of knowledge is useful for anyone trying to understand the real reach of the organization.
Write down what the community looks like, how it stays connected, and who inside the organization maintains those relationships. Even a rough map is more useful than nothing when someone new needs to understand the ecosystem.